Hi, I got a few MX-28. For each servo, there are sound coming out whenever I carry it or shake it. Sounds like there is a broken component inside each servo case. Is this normal? Also, even I set the goal position to a value, the present position is a value within +-4 different. Is this an encoder problem? Is the difference in encoder reading acceptable?

Hi, I got a few MX-28. For each servo, there are sound coming out whenever I carry it or shake it. Sounds like there is a broken component inside each servo case. Is this normal? Also, even I set the goal position to a value, the present position is a value within +-4 different. Is this an encoder problem? Is the difference in encoder reading acceptable?